Shoot down 10 bombs in 1910.
Complete 1970, making it through to 1982.
Shoot down 20 homing missiles in 1970.
Rescue 10 parachuters in one game.
Shoot down all the planes from a single formation 3 times in one game.
Reach 1940 without losing a life.
Complete 1940, making it through to 1970.
Shoot down 4 bomber planes in 1940.
Complete 1910, making it through to 1940.
Reach 2001 without losing a life.
Complete 1982, making it through to 2001.
Complete 2001.